Identification

Description

The valves are spindle shaped, with parallel margins and abruptly tapering apices with the ends turned in opposite directions. The fibulae are small and evident along the length of the valve, with a density of 14-20 in 10 µm. The central nodule is evident. Striae are not visible in the light microscope.

Citations

Links

Cite This Page

Kociolek, P. (2011).
Nitzschia reversa.
In Diatoms of North America.
Retrieved June 07, 2020, from https://diatoms.org/species/nitzschia_reversa

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Nitzschia reversa from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)STRAHLER = distribution plot of the Strahler Stream Order SLOPE = stream reach gradient (degrees)W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.PHSTVL = pH measured in a sealed syringe sample (pH units)log_COND = log concentration of specific conductivity (µS/cm)log_PTL = log concentration of total phosphorus (µg/L)log_NO3 = log concentration of nitrate (µeq/L)log_DOC = log concentration of dissolved organic carbon (mg/L)log_SIO2 = log concentration of silicon (mg/L)log_NA = log concentration of sodium (µeq/L)log_HCO3 = log concentration of the bicarbonate ion (µeq/L)EMBED = percent of the stream substrate that is embedded by sand and fine sedimentlog_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.

Nitzschia reversa

W.Sm. 1853

Apices very long, narrow

Apices deflected in opposite directions

Valves fine

Striae extremely fine

The valves are very fine, with long and narrow apices that are deflected in opposite directions. The striae are extremely fine.